Update `legacy` test to be in Warn Range (#12168)

I updated the error and warn versions in this PR: https://github.com/flutter/flutter/pull/189109, which broke the flutter roll into packages. The legacy version was below the error version, so I upgraded the version to the error version (which is in the warn range).

Some helpful definitions:
[very low version, error version) --> in error range; app fails (legacy test fell in this range)
[error version, warn version) --> in warn range (warning logs)
[warn version, some very modern version) --> safe range (no logs)

Fixes: https://github.com/flutter/flutter/issues/189218

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.ci/legacy_project/README.md

diff --git a/.ci/legacy_project/README.md b/.ci/legacy_project/README.md
index 106274f..2755fa9 100644
--- a/.ci/legacy_project/README.md
+++ b/.ci/legacy_project/README.md
@@ -41,12 +41,12 @@
   `build.gradle` to maintain compatibility with plugins that use
   Flutter's most recently supported API version.
 - Modifies `gradle-wrapper.properties` to upgrade the Gradle version
-  from 8.4 to 8.11.1. If a user runs into an error with the Gradle
+  from 8.4 to 8.14. If a user runs into an error with the Gradle
   version, the warning is clear on how to upgrade the version to
   one that we support.
 - Modifies `settings.gradle` to upgrade the Android Gradle Plugin (AGP)
   from version 8.3.0 (originally set in `build.gradle`; see bullet below)
-  to 8.9.1. If a user runs into an error with the AGP version, the warning
+  to 8.11.1. If a user runs into an error with the AGP version, the warning
   is clear on how to upgrade the version to one that we support.
 - Refactor plugin to use declarative Gradle apply instead of the
   imperative apply (this includes moving where the Android Gradle

.ci/legacy_project/all_packages/android/gradle/wrapper/gradle-wrapper.properties

diff --git a/.ci/legacy_project/all_packages/android/gradle/wrapper/gradle-wrapper.properties b/.ci/legacy_project/all_packages/android/gradle/wrapper/gradle-wrapper.properties
index 9162f10..4cc8c0b 100644
--- a/.ci/legacy_project/all_packages/android/gradle/wrapper/gradle-wrapper.properties
+++ b/.ci/legacy_project/all_packages/android/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-all.zip

.ci/legacy_project/all_packages/android/settings.gradle

diff --git a/.ci/legacy_project/all_packages/android/settings.gradle b/.ci/legacy_project/all_packages/android/settings.gradle
index adf2022..45eb33d 100644
--- a/.ci/legacy_project/all_packages/android/settings.gradle
+++ b/.ci/legacy_project/all_packages/android/settings.gradle
@@ -19,7 +19,7 @@
 // See https://github.com/flutter/flutter/blob/master/docs/ecosystem/Plugins-and-Packages-repository-structure.md#gradle-structure for more info.
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "8.9.1" apply false
+    id "com.android.application" version "8.11.1" apply false
     id "org.jetbrains.kotlin.android" version "2.2.20" apply false
 }